Pedestal Looseness Fault Analysis of Overhanging Dual-Disc Rotor-Bearing

Ren, Zhao Hui; Teng, Yun; Chen, Ya Zhe; Wen, Bang Chun

doi:10.4028/www.scientific.net/amm.16-19.654

Cited by 4 publications

(3 citation statements)

References 2 publications

(2 reference statements)

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“…The nonlinear finite element method was applied to study the nonlinear characters of overhanging dual-disk rotor bearing for pedestal looseness fault in ref. [5]. Goldman and Muszynska [6] performed experiments and analytical and numerical investigations on the unbalanced response of a rotating machine with looseness pedestal at one end, and that model was simplified as a bilinear form vibrating system.…”

Section: Introductionmentioning

confidence: 99%

Stability analysis of reduced rotor pedestal looseness fault model

Jin

Chen

et al. 2015

Nonlinear Dyn

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In this paper, the nonlinear dynamic characteristics of a rotor system supported by ball bearings with pedestal looseness are analyzed. The model of seven-degrees of freedom (DOFs) rotor system is established by the Newton's second law, which comprises a pair of ball bearings with pedestal looseness at one end. Energy analysis of the original model states that the first two-order proper orthogonal modes occupy almost all the energy of the system, and it demonstrates that the reduced model reserves main dynamical topological characteristics of the original one. A modified proper orthogonal decomposition method is applied in order to reduce the DOFs from seven to two, and the reduced system preserves the bifurcation and amplitude-frequency characteristics of the original one. The harmonic balance method with the alternating frequency-time domain technique is used to calculate the periodic response of the reduced system. Moreover, stability of the two-DOFs model is analyzed based on the known harmonic solution by the Floquet theory.

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Section: Introductionmentioning

confidence: 99%

Stability analysis of reduced rotor pedestal looseness fault model

Jin

Chen

et al. 2015

Nonlinear Dyn

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“…Chu et al studied the chaotic properties of rotor-bearing system with pedestal looseness fault [1]; Ma etc. studied the fault characteristic when changing the loosening clearance's size of bearing cover or the looseness stiffness [2]; Z. H. Ren et al had applied nonlinear finite element method to study the nonlinear characters of overhanging dual-disc rotor bearing for pedestal looseness fault [3]. But most of the research methods for solving dynamics model are limited to numerical integration, unable to achieve the analytic solution of vibration response.…”

Section: Introductionmentioning

confidence: 99%

Bearing Looseness Fault Characteristics Analysis of Rotor System Based on Incremental Harmonic Balance Method

Xiong

Qin

Cao

2013

AMM

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Support or pedestal looseness fault exists in mechanical system typically.A new dynamical model of an eccentric motor rotor system with a piecewise-linear stiffness was proposed, and the incremental harmonic balance method was employed to obtain analytic solutions of the model. Then, the time domain waveform and amplitude spectrogram were achieved by applying the analytic solutions to program and iterate in the MATLAB software. Finally, the characteristics of looseness was analyzed. Results show that this research method is feasible, and this paper may provide a theoretical basis for the solution of complex bearing looseness model analytically and the diagnosis of its fault.

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“…These mathematical models based methods mainly focus on the impacts of pedestal looseness on the nonlinear vibration characteristics of rotor systems; the influence of varying disk mass is not considered and analyzed. As a powerful technique, finite element (FE) method is also employed to analyze the dynamics of bearing-rotor systems with pedestal looseness [19][20][21]. Although different mass, moment inertia, and looseness clearance are included easily to study the influences on the dynamic characteristics, the variances of severity of dynamical nonlinearity are not investigated yet.…”

Section: Introductionmentioning

confidence: 99%

The Influence of Slowly Varying Mass on Severity of Dynamics Nonlinearity of Bearing‐Rotor Systems with Pedestal Looseness

Jiang

Liu

2018

Shock and Vibration

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Nonlinearity measure is proposed to investigate the influence of slowly varying mass on severity of dynamics nonlinearity of bearing-rotor systems with pedestal looseness. A nonlinear mathematical model including the effect of slowly varying disk mass is developed for a bearing-rotor system with pedestal looseness. The varying of equivalent disk mass is described by a cosine function, and the amplitude coefficient is used as a control parameter. Then, nonlinearity measure is employed to quantify the severity of dynamics nonlinearity of bearing-rotor systems. With the increasing of looseness clearances, the curves that denote the trend of nonlinearity degree are plotted for each amplitude coefficient of mass varying. It can be concluded that larger amplitude coefficients of the disk mass varying will have more influence on the severity of dynamics nonlinearity and generation of chaotic behaviors in rotor systems with pedestal looseness.

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Pedestal Looseness Fault Analysis of Overhanging Dual-Disc Rotor-Bearing

Cited by 4 publications

References 2 publications

Stability analysis of reduced rotor pedestal looseness fault model

Stability analysis of reduced rotor pedestal looseness fault model

Bearing Looseness Fault Characteristics Analysis of Rotor System Based on Incremental Harmonic Balance Method

The Influence of Slowly Varying Mass on Severity of Dynamics Nonlinearity of Bearing‐Rotor Systems with Pedestal Looseness

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